KR101072432B1 - Optical filter for display apparatus and display apparatus comprising the same - Google Patents

Abstract

Provided are an optical filter for a display device in which cloudiness is prevented and a display device including the same. An optical filter for a display device includes a first optical film including a transparent support substrate, a first optical film formed on the front surface of the support substrate, and an antireflection layer formed on the front surface of the first optical substrate, and a rear surface of the support substrate. And a second optical film positioned on the outermost side and including a transparent second optical substrate and an antistatic coating film formed on a immediately after surface of the second optical substrate.

Optical filter, optical film, PET, antistatic coating

Description

Optical filter for display apparatus and display apparatus including the same

1 is a schematic exploded perspective view of a PDP apparatus according to an embodiment of the present invention.

2 is an exploded perspective view of an optical filter for a display device according to an embodiment of the present invention.

3 is a longitudinal cross-sectional view of FIG. 2.

4 is an exploded perspective view of an optical filter for a display device according to another embodiment of the present invention.

5 is a longitudinal cross-sectional view of FIG. 4.

6 is an exploded perspective view of an optical filter for a display device according to still another embodiment of the present invention.

7 is a longitudinal cross-sectional view of FIG. 6.

<Explanation of symbols for the main parts of the drawings>

100: support substrate 200: first optical film

300: third optical film 400: second optical film

500: optical filter

The present invention relates to an optical filter for a display device, and more particularly, to an optical filter for a display device in which cloudiness is prevented and a display device including the same.

As the modern society is highly informationized, display devices are facing market demands for larger and thinner displays, and conventional CRT devices do not sufficiently satisfy these requirements. Therefore, plasma display panel (PDP) devices and PALC ( Flat panel display devices such as plasma address liquid crystal display panel (LCD) devices, liquid crystal display (LCD) devices, organic light emitting diode (OLED) devices, and field emission display (FED) devices are being actively researched as next generation display devices. . Among them, the plasma display device (PDP), which has an excellent viewing angle and is easy to be enlarged and thinned as a self-luminous device, is in the spotlight, and in particular, the large-scale television field is gradually replacing the cathode ray tube (CRT).

The PDP device displays an image by using a gas discharge phenomenon generated when a high voltage is applied to the gas. Near-infrared rays which cause malfunctions of electromagnetic interference (EMI), a remote control, etc., which are harmful to a human body due to high voltage are applied. (Near Infrared Ray; NIR), and neon light or the like that adversely affects color purity with orange light.

In order to shield the electromagnetic waves, near infrared rays, neon light, etc., the PDP apparatus includes an optical filter for a display device in which a plurality of optical films having an electromagnetic shielding function, a near infrared shielding function, and a color correction function are stacked on a supporting substrate. . Such an optical filter is disposed on the front of the display panel of the PDP apparatus and spaced apart from the display panel. However, when the optical films are based on PET, the PET may be exposed to the atmosphere containing moisture in the space between the optical filter and the display panel. In this case, the reaction between the PET and the moisture or ions contained therein As a result, a clouding phenomenon may occur in which the base substrate becomes cloudy. Since such opacity occurs between the optical filter and the display panel, it is troublesome to disassemble the optical filter in order to clean it.

It is an object of the present invention to provide an optical filter for a display device in which cloudiness is prevented.

Another object of the present invention is to provide a display device including the optical filter for a display device as described above.

Technical problems to be achieved by the present invention are not limited to the above-mentioned technical problems, and other technical problems not mentioned will be clearly understood by those skilled in the art from the following description.

An optical filter for a display device according to an embodiment of the present invention for achieving the technical problem is formed on the transparent support substrate, the front surface of the support substrate, the transparent first optical substrate, and the front surface of the first optical substrate A second optical film including a first optical film including an anti-reflection layer formed thereon, and a second optical substrate positioned at an outermost side of the rear surface of the support substrate, and an antistatic coating film formed on immediately after the second optical substrate; It includes a film.

According to another aspect of the present invention, there is provided a display apparatus including a panel assembly including a plurality of discharge cells in which gas discharge occurs, and a display as described above disposed at a predetermined interval in front of the panel assembly. An optical filter for the device.

Specific details of other embodiments are included in the detailed description and the accompanying drawings.

Advantages and features of the present invention, and methods for achieving them will be apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various forms, and only the present embodiments are intended to complete the disclosure of the present invention, and the general knowledge in the art to which the present invention pertains. It is provided to fully convey the scope of the invention to those skilled in the art, and the present invention is defined only by the scope of the claims. Like reference numerals refer to like elements throughout.

The spatially relative terms " below ", " beneath ", " lower ", " above ", " upper " It can be used to easily describe the correlation of a device or components with other devices or components. Spatially relative terms are to be understood as including terms in different directions of the device in use or operation in addition to the directions shown in the figures. For example, when flipping a device shown in the figure, a device described as "below or beneath" of another device may be placed "above" of another device. Thus, the exemplary term "below" can encompass both an orientation of above and below. The device may be oriented in other directions as well, in which case spatially relative terms may be interpreted according to orientation.

An optical filter for a display device according to embodiments of the present invention may be mounted on the front of the display device and used. Examples of such display devices include a plasma display panel (PDP) device, a liquid crystal display (LCD) device, a plasma address liquid cristal (PALC) device, an organic light emitting diode (OLED) device, a field emission display (FED) device, And a large display device such as a cathode ray tube (CRT), a small mobile display device such as a PDA (Personal Digital Assistants), a small game machine display window, a mobile phone display window, and a flexible display device. Preferably, the present invention is applied to a PDP apparatus having a large need for electromagnetic shielding and color correction. Hereinafter, for convenience of description, the present invention will be described using an optical filter for a PDP device and a display device used therefor. However, the present invention is not limited thereto, and the present invention is not limited thereto. Of course, it can be applied.

In the present specification, an optical filter for a display device may be simply referred to as a filter or an optical filter.

Hereinafter, an optical filter for a display device and a PDP device including the same according to embodiments of the present invention will be described with reference to the accompanying drawings.

1 is a schematic exploded perspective view of a PDP apparatus according to an embodiment of the present invention.

Referring to FIG. 1, a panel assembly including a case 10, a cover 40 covering an upper portion of the case, a driving circuit board 20 accommodated in the case 10, and a discharge cell in which gas discharge occurs. 30 and an optical filter 50 for a display device disposed in front of the panel assembly 30 at predetermined intervals.

The panel assembly 30 includes a transparent front substrate (not shown) and a transparent back substrate (not shown), and display an image by light emission of discharge cells (not shown) separated by partition walls (not shown). do. The optical filter 50 is disposed spaced apart from the panel assembly 30 by a predetermined interval, and fixedly mounted through the cover 40 or the case 10. The optical filter 50 includes at least one optical film layer (not shown) and is grounded with the cover 40 and / or the case 10.

As the optical filter 50, various optical filters (see '500' of FIGS. 2 and 3 and '501' of FIGS. 4 and 5) according to embodiments of the present invention described below may be applied. Hereinafter, specific embodiments applicable to the optical filter 50 as described above will be described.

FIG. 2 is an exploded perspective view of an optical filter for a display device according to an exemplary embodiment, and FIG. 3 is a longitudinal cross-sectional view of FIG. 2.

2 and 3, the optical filter 500 for a display device includes a support substrate 100, a first optical film 200 positioned on a front surface of the support substrate, and a second optical film positioned on a rear surface of the support substrate. 400. In addition, the optical filter 500 may further include a third optical film 300 disposed between the support substrate 100 and the second optical film 400.

The supporting substrate 100 serves to support the first optical film 200, the second optical film 400, the third optical film 300, and the like, and is mounted on the display device, that is, in this embodiment, of the PDP device. It has substantially the same shape and size as the display screen. For example, when the display screen of the PDP device is rectangular, the display screen may have a rectangular shape, and when applied to a 42-inch display device, for example, the display screen may have a size of about 984 mm × 584 mm. The shape of the support substrate 100 may be modified in various other forms according to the design applied, of course.

The support substrate 100 is made of a transparent material so as not to excessively reduce the brightness of the display device. For example, although not limited to the following, a glass substrate having good transparency, polycarbonate (PC), an acrylic resin, or the like may be used, and preferably, a glass substrate having excellent mechanical strength may be used.

The first optical film 200 is formed on the front surface of the support substrate 100, that is, on the viewer side of the PDP device. The first optical film 200 includes a first optical substrate 210, an antireflection layer 220, and a first adhesive layer 230 as a functional layer.

The first optical substrate 210 serves as a base substrate of the first optical film 200 to support the antireflection layer 220 and the like. Since the first optical substrate 210 is supported by the support substrate 100, the strength of the first optical substrate 210 is not as high as that of the support substrate 100. In addition, when attached to the support substrate 100 by a roll-to-sheet process, it is preferably made of a material having a certain degree of ductility. The first optical substrate 210 is made of a material having excellent transparency, for example, polyethylene terephthalate (PET).

An anti-reflection layer 220 is formed on the entire surface of the first optical substrate 210. The anti-reflection layer 220 prevents reflection of external light and improves image quality. The anti-reflection layer 220 may include a material having a refractive index of 1.5 or less in the visible region, for example, a fluorine-based transparent polymer resin, a silicone-based resin, silicon oxide, an acrylic resin, and the like, and may include two or more layers thereof. The anti-reflection layer 220 may further include a material having other optical properties in addition to the low refractive index material as described above. The anti-reflection layer 220 may be a coating film directly coated on the entire surface of the first optical substrate 210.

The anti-reflection layer 220 may form the outermost side in the front direction of the optical filter 500, and other functional layers such as a fluorine-based coating layer for preventing contamination, or the like may be formed on the anti-reflection layer 220. It may be further provided.

The first adhesive layer 230 is formed on the rear surface of the first optical substrate 210, and the first optical substrate 210 is attached to the support substrate 100 by the first adhesive layer 230. The first adhesive layer 210 may be formed of, for example, a pressure sensitive adhesive including a binder resin, a binder adhesive resin, and a crosslinking agent.

The third optical film 300 and the second optical film 400 are sequentially formed on the rear surface of the support substrate 100, that is, the panel assembly (see '30' in FIG. 1) of the PDP device.

For convenience of description, the third optical film 300 will be described first, and the third optical film 300 includes a third optical substrate 310, a conductive mesh layer 320, and a third adhesive layer 330.

The third optical substrate 310 serves as a base substrate of the third optical film 300 to support the conductive mesh layer 320 and the like. The third optical substrate 310 may be formed of substantially the same substrate as the first optical substrate 210 described above, and a description thereof will not be repeated.

A conductive mesh layer 320 is formed on one surface, for example, a rear surface of the third optical substrate 310. Specifically, a conductive film (not shown), such as copper (Cu) and nickel (Ni), may be panned into a mesh shape on the third optical substrate 310 by a photolithography process or the like. Electromagnetic waves emitted from the liquid crystal panel assembly of the PDP device may be absorbed by the conductive mesh layer 320 to suppress electromagnetic wave emission toward the viewer.

Meanwhile, a third adhesive layer 330 is formed on the front surface of the third optical substrate 310 to mediate adhesion between the third optical substrate 310 and the support substrate 100. The third adhesive layer 330 may be made of the same material as the first adhesive layer 210 described above, and a duplicate description thereof will be omitted.

Subsequently, when the second optical filter 400 is described, the second optical filter 400 is located at the rear side of the third optical filter 300 and forms the outermost side in the rear direction of the optical filter 500. The second optical filter 400 includes a second optical substrate 410, an antistatic coating film 420, a near infrared absorbing layer 440, and a second adhesive layer 430.

The second optical substrate 410 is substantially the same as the first optical substrate 210 and is made of, for example, PET.

Immediately after the second optical substrate 410, an antistatic coating film 420 is formed on the rear surface of the optical filter 500 as a layer closest to the panel assembly. The antistatic coating film 420 may have, for example, a surface resistance of 1 × 10 ¹² Pa / □ or less, and may be made of a material having both a lipophilic group and a hydrophilic group.

When the second optical substrate 410 is made of PET, an oligomer component remains on the surface of the second optical substrate 410. When the oligomer component is exposed to the outside, Na ions contained in moisture in the air Or Cl ions and the like, and as a result, the display screen may appear cloudy or cloudy. In order to prevent this, the antistatic coating layer 420 may be formed on the surface of the second optical substrate 410 to block contact between the second optical substrate 410 and moisture and the ions contained therein. That is, the hydrophilic group of the material constituting the antistatic coating film 420 is bonded to the oligomer component of the second optical substrate 410, while the lipophilic group is located on the surface of the antistatic coating film 420. Therefore, the contact between the moisture in the air and the like, the antistatic coating film 420 and the second optical substrate 410 located therein may be blocked to prevent clouding.

As another example of the antistatic coating film 420, a coating film coated with a transparent conductive inorganic material such as AZO (a small amount of aluminum added to ZnO) or ITO (Indium Tin Oxide) may be used. In the case of the coating film made of such an inorganic material, the same as in the above case it blocks the contact between the water and the PET surface.

The material constituting the antistatic coating film 420 and the method of coating the same are not limited to the above examples, and various materials and methods known in the art may be applied. Detailed description of the various embodiments will be omitted to avoid unreasonably limited interpretation of the present invention.

On the other hand, as another example for preventing the clouding as described above, instead of the anti-static coating film 420 may be provided with a hard coating film (not shown). That is, as described above, the clouding phenomenon occurs because the oligomer component located on the surface of the second optical substrate 410 made of PET is exposed to the outside, so that the surface of the oligomer component is exposed to acrylic resin or the like. It may be provided with a hard coating film made. Here, since the acrylic resin does not have an oligomer component on the surface, it does not react with Na ions or Cl ions contained in moisture in the air, so that the cloudiness may be prevented.

Subsequently, a near-infrared absorbing layer 440 is formed on the entire surface of the second optical base 410. The near infrared absorbing layer 440 absorbs near infrared rays emitted from the panel assembly by containing a near infrared absorbing dye. Examples of the near-infrared absorbing dye include inorganic dyes such as cobalt dyes, iron dyes, chromium dyes, or titanium dyes, dimonium dyes, anthraquinone dyes, aluminum dyes, polymethine dyes, azo dyes, or the like. Organic dyes such as dithiol-based metal complex dyes, and the near-infrared absorbing layer 440 may include at least one of them.

The near infrared absorbing layer 440 may be directly coated on the front surface of the second optical substrate 410 and attached.

The second adhesive layer 430 is formed on the entire surface of the near infrared absorbing layer 440. The second adhesive layer 430 includes a pressure sensitive adhesive including a binder resin, a binder adhesive resin, and a crosslinking agent, such that the second optical base material 410 and the third optical film 300 on which the near infrared absorbing layer 440 is formed, Specifically, the adhesion of the third optical film 300 to the conductive mesh layer 320 is mediated.

The second adhesive layer 430 may further include a color correction pigment. As the color correction dyes, cyanine dyes, phthalocyanine dyes, porphyrin dyes, etc., which absorb neon wavelengths, may be used.

As a modification of the present embodiment, the second adhesive layer 430 may further include a near infrared absorbing dye, without separately providing the near infrared absorbing layer 440. In this case, at least one of the near-infrared absorbing dye and the color-correcting dye may be mixed after the functional group is inactivated in order to prevent the weakening of the durability due to the reaction between the color correcting dye and the near infrared absorbing dye.

In this embodiment, the case where the third optical film is disposed between the supporting substrate and the second optical film is illustrated, but the third optical film may be disposed between the front surface of the supporting substrate, for example, between the supporting substrate and the first optical film. Of course. More specific embodiments will be easily understood or inferred by those skilled in the art, and the description thereof will be omitted to avoid limited interpretation of the present invention. In this case, of course, if the antistatic coating film is provided on the rear surface of the optical filter, it is possible to prevent the clouding phenomenon.

Hereinafter, an optical filter for a display device according to another embodiment of the present invention will be described. 4 is an exploded perspective view of an optical filter for a display device according to another exemplary embodiment, and FIG. 5 is a longitudinal cross-sectional view of FIG. 4. In the present embodiment, the same structure as in the embodiment of the present invention will be omitted or simplified, and will be described based on the differences.

4 and 5, the optical filter 501 for a display device according to the present exemplary embodiment may include a third optical film 301 and a second optical film 401 sequentially formed on the rear surface of the support substrate 100. Include. In the third optical filter 301, the third adhesive layer 330 is formed on the front surface of the third optical substrate 310, which is the same as the embodiment of FIGS. 2 and 3, but the rear surface of the third optical substrate 310 is formed. There is a difference in that the conductive coating film 321 is formed in place of the conductive mesh layer.

More specifically, the conductive coating film 321 has a multilayer structure in which a conductive thin film layer and a high refractive index transparent thin film layer are alternately stacked.

Here, the conductive thin film layer is made of a silver (Ag) thin film having high conductivity and high permeability of house light, absorbing electromagnetic waves, and suppressing their emission by absorbing or reflecting near infrared rays. In addition, as a conductive thin film layer, in order to improve the physical and chemical stability of silver (Ag), silver (Ag) mixed with at least one metal selected from metals such as gold, platinum, palladium, copper, indium and tin ( Ag) alloys may be used.

The high refractive index transparent thin film layer increases the transparency in the visible light region and reduces the reflection of the visible light. That is, compared with the case where only the conductive thin film layer is laminated, alternately laminating the high refractive index transparent thin film layer is advantageous in terms of visible light transmittance. As the high refractive index transparent thin film layer, a material having a refractive index of 1.6 or more with respect to visible light may be used. For example, oxides such as niobium, indium, titanium, zirconium, bismuth, tin, or mixtures thereof may be used, and preferably niobium oxide (Nb ₂ O ₅ ), or indium tin oxide (ITO), or the like. This can be used.

In the second optical film 401, an antistatic coating film 420 is formed on a surface immediately after the second optical substrate 410, and as a modified example, a hard coating film may be used as the embodiment of the present invention. The second adhesive layer 431 containing a color correction pigment is formed on the entire surface of the second optical film 401 is different from the embodiment of the present invention. That is, in the present embodiment, since the second optical film 401 blocks the near infrared rays, it is not necessary to separately provide the near infrared absorption layer or the near infrared absorbing dye.

As described above, since the optical filter 501 according to the present exemplary embodiment prevents exposure of the oligomer component on the surface of the second optical substrate 410 by the antistatic coating film 420, the clouding phenomenon may be prevented.

In this embodiment, the case where the third optical film is disposed between the supporting substrate and the second optical film is illustrated, but the third optical film may be disposed on the front surface of the supporting substrate, such as between the supporting substrate and the first optical film. Of course. Even in this case, it will be readily understood that the antistatic coating film may be provided on the rear surface of the optical filter to prevent cloudiness.

Hereinafter, an optical filter for a display device according to still another embodiment of the present invention will be described. FIG. 6 is an exploded perspective view of an optical filter for a display device according to still another embodiment, and FIG. 7 is a longitudinal cross-sectional view of FIG. 6. In the present embodiment, the same structure as in the other embodiment of the present invention will be omitted or simplified, and will be described mainly on the difference.

6 and 7, the optical filter 502 for the display device according to the present exemplary embodiment does not include the third optical film, and the conductive coating film 110 is disposed on the rear surface of the support substrate 100 without any separate description. It is different from other embodiments of the present invention in that it is directly formed. The conductive coating film 110 has a multilayer structure in which a conductive thin film layer and a high refractive index transparent thin film layer are alternately stacked. The conductive coating film 110 may have a structure substantially the same as the conductive coating film 421 of FIGS. 4 and 5, and a detailed description thereof will be omitted.

The second optical filter 401 is the same as in the embodiment of FIGS. 4 and 5 except that the second optical filter 401 is directly attached to the rear surface of the conductive coating film 110 through the second adhesive layer 431.

As described above, the optical filter 502 according to the present embodiment may prevent the exposure of the oligomer component on the surface of the second optical substrate 410 by the antistatic coating film 420, and may suppress the clouding phenomenon. .

In this embodiment, the case in which the conductive coating film is directly formed on the rear surface of the support substrate is illustrated, but the present invention is not limited thereto and may be formed directly on the front surface of the support substrate. Also in this case, when the antistatic coating film is provided on the rear surface of the optical filter, the clouding phenomenon can be suppressed.

Subsequently, more detailed description of the present invention will be described with reference to the following specific experimental examples, and details not described herein will be omitted because they are sufficiently technically inferred by those skilled in the art.

Experimental Example 1

A mesh film (ES-1534U, Hitachi) including a conductive mesh layer was attached to one surface of a glass substrate using a sheet-to-sheet laminator.

Subsequently, an antistatic layer was coated on one surface of PET (PET-4300, Toyobo Corporation), and then an adhesive layer containing a color correction pigment was coated on the other surface of the PET by a comma coating. The antistatic layer and the adhesive layer-coated PET were then attached onto a mesh film attached to the glass substrate using a roll-to-sheet laminator.

Moreover, the 7702UV-S film of Nippon Oil Industries, Ltd. was attached to the other surface of the glass substrate using the sheet-to-sheet laminator, and the optical filter for display apparatuses was manufactured.

Comparative Example 1

An optical filter for a display device was manufactured in the same manner as in Experiment 1, except that the antistatic layer was not coated on one surface of PET (PET-4300, Toyobo Co., Ltd.).

After arranging the optical filters for display devices manufactured by Experimental Example 1 and Comparative Experimental Example 1 vertically, after providing water for 2 hours using a humidifier, the surface change of each filter was visually observed. The results are shown in Table 1 below.

Experimental Example 1 Comparative Experimental Example 1 Visual inspection normal Smear

In Comparative Example 1 in which the antistatic layer was not coated from Table 1, PET was exposed to moisture, and staining occurred. However, in Experimental Example 1 in which PET was protected by the antistatic layer, staining did not occur, indicating that no turbidity was caused. Can be.

Although the embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to the above embodiments but may be manufactured in various forms, and having ordinary skill in the art to which the present invention pertains. It will be understood by those skilled in the art that the present invention may be embodied in other specific forms without changing the technical spirit or essential features of the present invention. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive.

As described above, according to the optical filter for a display device according to the embodiments of the present invention, since the PET is not directly exposed to the space between the optical filter and the panel assembly, and is protected by an antistatic coating film or a hard coating film, the clouding phenomenon is prevented. Can be.

Claims (16)

delete delete delete Transparent support substrate; A first optical film formed on the front surface of the support substrate; And Located on the back of the support substrate, including a second optical film including an antistatic coating film formed on the outermost side of the back of the support substrate, The first optical film includes a transparent first optical substrate, and an antireflection layer formed on the entire surface of the first optical substrate, The second optical film further comprises a transparent second optical substrate, wherein the antistatic coating film is formed on the immediately after the second optical substrate, The second optical substrate is made of PET, The antistatic coating film is an optical filter for a display device having a surface resistance of 1 × 10 ^{12 12} / □ or less. 5. The method of claim 4, The antistatic coating film is an optical filter for a display device consisting of a transparent conductive inorganic material or a material having a lipophilic group and a hydrophilic group at the same time. 6. The method of claim 5, And a third optical film including a transparent third optical substrate and a conductive mesh layer formed on one surface of the third optical substrate between the support substrate and the second optical film or between the support substrate and the first optical film. Optical filter for display device. The method according to claim 6, The second optical film further comprises an adhesive layer containing a near-infrared absorbing layer and a color correction dye which are sequentially formed on the entire surface of the second optical substrate. The method according to claim 6, The second optical film further comprises an adhesive layer containing a near infrared absorbing dye and a color correction dye formed on the entire surface of the second optical substrate. 6. The method of claim 5, A transparent third optical substrate and one surface of the optical substrate between the supporting substrate and the second optical film or between the supporting substrate and the first optical film, the at least one conductive thin film layer and the at least one high refractive index transparent thin film layer An optical filter for display device further comprising a third optical film comprising a conductive coating film having a. The method of claim 9, The second optical film further comprises an adhesive layer containing a color correction pigment formed on the entire surface of the second optical substrate. 6. The method of claim 5, And a conductive coating film having at least one conductive thin film layer directly formed on one surface of the support substrate and at least one high refractive index transparent thin film layer. 12. The method of claim 11, The second optical film further comprises an adhesive layer containing a color correction pigment formed on the entire surface of the second optical substrate. delete Transparent support substrate; A first optical film formed on the front surface of the support substrate and including a transparent first optical substrate and an antireflection layer formed on the front surface of the first optical substrate; And A second optical film positioned on the outermost side of the rear surface of the support substrate, the second optical film including a transparent second optical substrate, and a hard coating film formed on immediately after the second optical substrate; The second optical substrate is made of PET, the hard coating film is an optical filter for a display device made of an acrylic resin. Transparent support substrate; A first adhesive layer formed on an entire surface of the support substrate; A first optical substrate attached to a front surface of the first adhesive layer; An anti-reflection layer formed on the first optical substrate; A second adhesive layer formed on a rear surface of the support substrate; A second optical substrate attached to a rear surface of the second adhesive layer; A conductive mesh layer formed on a rear surface of the second optical substrate; A third adhesive layer formed on a rear surface of the conductive mesh layer and containing a color correction pigment; A third optical substrate attached to a rear surface of the third adhesive layer; And Optical filter for display device comprising an antistatic coating film formed on the immediately after the third optical substrate. A panel assembly including a plurality of discharge cells in which gas discharge occurs; And A display device comprising an optical filter for a display device according to any one of claims 4 to 12, 14 and 15, which are spaced apart in front of the panel assembly.

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